Support for expanding reamers



G. L. WOOD.

' SUPPORT FOR EXPANDING REAMERS.

APPLICATION FILED AUG.17- i920.

Patented May 24, 1921.

2 SHEETS-SHEET 1 G. L. WOOD;

SUPPORT FOR EXPANDING REAMERS. APPLICATION FILED Aucm, 1920.

Patnted May 24, 1921.

2 suesrs HE T 2 1:? I

I72 Fania)" 'eazyel .ll oaai UNITED STATES .onoRGEL. ,vvoon; orWORCESTER, MAssAoHusErrs;

SUPPORT FOR EXPANDING RE AMERS.

Application filed August 17, 1920. Serial in. 464,218:

To all whom it may concern Be it'known. that I, GEORGE L. WOOD, acitizen of the United States, residing at Worcester, in the county ofWorcester and Commonwealth of Massachusetts, have invented a new; anduseful Improvement in Supports for Expanding Reamers, of which thefollowing is a specification, accompanied by drawings forming a part ofthe same.

The object of my present improvement is to provide a support for anexpanding reamer while the latter is undergoing the operation of beingground, and in the accompanying drawings Iwhave shown an expandingreamer'held in'asupport embodying my present invention, which enablesthe reamer to be ground independently of its centers. In grindingreamers; of the ordinary non-expan'ding type,'-it is possible to supportthe reamer upon its. centers, but

in the case of expanding reamers this method is not available, for thereason that the expanding plug is screwthreaded into the reamer whichdestroys the accuracy of. the center provided in the expanding plug.

By my improvement I support the reamer by the cylindrical portions atopposite ends of the reamer by means of V-shaped supports in alinementwith each other. I also pro vide means whereby reamers of differentsizes are to be supported and securely clamped in the same V-shapedsupports.

In the accompanying drawings I have,

1 shown only such parts as are necessary to illustrate the character ofmy present invention, the mechanism for rotatlng the grinding wheelbeing omitted.

In the accompanying drawings,

Figure 1 represents in side elevation my reamer supporting device, witha reamer held therein, showing in broken lines the position of thegrinding wheel.

Fig. .2 is a plan view of the reamer and its support.

Fig. 3 is an end view of the front V shaped support. I

Fig. 4 is an end v1ew showing the rear V-shaped support, with the reamershown in sectional view on" the plane of the broken line 4-4, Fig. 1.

Fig. 5 is an end view of the reamer clamping mechanism illustratlng thead ust ment for holding reamers of different sizes without changing theV-shaped supports.

Similar reference characters refer to similar parts in the differentfigures.

Specification of Letters Patent.

Referring to F 1, l denotes the havlng a cylindrlcal section 2, .uponwhichthe cutting teeth are formed, theteeth, however, belng omltted inthe different views.

The reamer is provided with a cylindrical' section 3, upon its frontend, and a similar cylindrlcal sectlon 4 upon its opposite end,

and having a square section for the appli- PatentedMay 24, 19 21.

adjustable along the table 6 and are'held in their adjusted position bythe clamping screws12 and 13. To each of the V-shapedsupports isattached a clamping mechanism,

consisting of the vertically. adjustable bar 14 curved at 15 to extendover the V-shaped support, and slotted at 16 to carrya clamping fork 17adapted to rest upon the cylindrlcal sections 2 and 3 of the reamer,said fork having a screw threaded shank 18, carrying a check nut 19,which is screwed tightly against the under side of the ad- When smallersizes are to be ground, blocks 20, 2'1 and 22 are inserted and held by ascrew 23 entering the block 20. The blocks 21 and 22 are provided withdowel pins 24 and 25 entering holes in the blocks 20 and 21, the circle26 representing a reamer of smaller diameter. In Fig. 1, the broken'lines 27 represent the position of a cup shaped grinding wheel, such asare usually employed in grinding reamers of this class. The reamer ishollow as shown by the broken lines 28, Fig. 1, the interior beingprovided with a tapered surface fitting a tapered plug 29, having a neck30 and a screw threaded section 31 fitting a screw threaded hole in thecylindrical section 2, and pro vided with a flattened tip 32 by whichthe tapered plug 29 may be screwed into the reamer to expand the cuttingteeth when the latter become worn, in order to maintain the desireddiameter of the reamer when the teeth have been ground.

I am aware that V-shaped supports have heretofore been employed forsupporting articles of various kinds, and I do not claim such broadly,nor do I claim broadly a clamping device by which articles are held insuch supports.

The operation of grinding an expanding reamer and preserving itsdiameter is one ofi great delicacy, requiring extreme accuracy, oftenwithin the thousandth part of an inch, and so far as I. am aware nodevice has been proposed capable of accomplishing this result, which Iaccomplish by means of my present invention. Screw threaded clamps havebeen proposed forholding articles in a V-shaped'support, but in suchclamping devices, while employing a forked clamphaving a screw threadedshank, the upward strain is received by the shank, but in myconstruction the upward strain upon the clamp is received by the checknut bearing against the under side'of the curved bar 1%.

Attached to the base of the V-shaped support 7 is a stop 33 extendingupwardly to contact with the end of the reamer and hold it fromlongitudinal movement.

slotted bar, carrying a check nut to prevent its upward movement.

2 A support for a reamer of the class described, during the operation ofgrinding,

comprising a pair of V-shaped supports spaced apart and adjustablysupported in allnement with each other, with one of said V-shapedsupports'provided with an adjustable guide for limiting the rotative'movement of the reamer, and a stop for limiting the 'endwise movement ofthe reamer. 1 y

8. In a support for a reamer of the class described, the combinationwith a 'V-shaped support, of a clamping device comprising a verticallyadjustable bar curved to extend horizontally over a reamer, with a slotin its horizontal extension, a forked clamp provided with a screwthreaded shank passing through said slot, and a check nut held on saidshank and bearing against the nude side of said horizontal extension.

GEORGE L. WOOD.

